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Please Help, I can't figure this out

A particle moves according to a law of motion s = f(t) = t3 - 12t2 + 45t, t 0, where t is measured in seconds and s in feet.

a.When is the particle speeding up?

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b.When is it slowing down?

(????,????)U(????,????)

Please Help, I can't figure this out A particle moves according to a law of motion s = f(t) = t3 - 12t2 + 45t, t 0, where t is measured in seconds and s in feet class=

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